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Costs and Estimated Earnings in Excess of Billings (Details) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2014	Jul. 27, 2013
Contractors [Abstract]
Costs incurred on contracts in progress	$ 198,485	$ 208,250
Estimated to date earnings	44,394	49,150
Total costs and estimated earnings	242,879	257,400
Less: billings to date	(82,610)	(66,839)
Total costs in excess of billings	160,269	190,561
Costs and estimated earnings in excess of billings	174,138	204,349
Billings in excess of costs and estimated earnings	$ (13,869)	$ (13,788)

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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- Definition

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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